Yeah, I talk to myself more than is probably healthy for a sane person. I'm not ashamed, though! I totally forgot about the advanced maps! I was so excited when I beat it that they slipped my mind. I guess I'll get to those now.

There are right there in the game under an option on the main menu. There are Advanced maps, which are just more difficult versions of existing maps and there is a Challenges section. Looks like timed maps.